Detachable shovel-tooth point.



G. H. MULRONEY & I. B. MANNING.

DETAOHABLE SHOVEL TOOTH POINT.

APPLICATION FILED FEB. 16, 1911.

Patented May 9, 1911.

l l I 1 m NW m w M Q 5 AnagfiM/ann/fly ATTORNEYS WITNESSES A J W YA M UNITED STATES PATENT OFFICE.

CHARLES H. MULRONEY AND ISAAC B. MANNING, 0 BROWN STATION, NEW YORK.

DETACHABLE SHOVEL-TOOTH POINT.

To all whom it may concern:

Be it known that we, CHARLES H. MUL- RONEY and ISAAC B. MANNING, citizens of the United States, and residents of Brown Station, in the county of Ulster and State of New York, have invented a new and Improved Detachable Shovel-Tooth Point, of which the following is a full, clear, and exact description.

Our invention relates to an improved design of shovel tooth point to be used on steam shovels and other excavating apparatus. It is so constructed that it can be readily put on the end of a tooth and fixed thereto, and readil detached therefrom so as to be replace when it is worn out.

To this end our improved tooth point is so constructed that it can be fitted upon the end of the body of the tooth by means of a tenon and mortise, preferably of the dove-tail type, so as to form a dove-tailed joint. The longitudinal axis of this joint is approximately parallel to the line of thrust of the tooth,-so that in practice the joint between the body and point of the tooth will be subjected to no stresses whatever, except the end thrust of the apparatus when the shovel makes its working stroke; thus shearing and bending stresses are eliminated.

Reference is to be had to the accompanying drawings forming a part of this specification, in which the same characters of reference indicate the same parts in all the views.

Figure 1 is a side elevation of the body of the tooth of the steam shovel with our improved point in position on the end thereof; Fig. 2 is a transverse vertical section on the line 22 of Fig. 1; and Fig. 3 is a side elevation of our improved tooth point in detached position.

The body of the toothTs indicated by the numeral 1, and this tooth is fixed to the lip of a steam shovel dipper or other excavating device by means of bolts or rivets 3. The forward or working end thereof of course projects beyond the edge of the lip of the shovel dipper 2, and to this end We attach our improved tooth point 4. This point consists o a suitable piece of metal having a rear surface 16, a forward surface 17 and side surfaces 18, the forward and rear surfaces and, if desired, the side surfaces also, converging to a beveled edge or point 5. The base of the tooth point consists of a Specification of Letters Patent.

Application filed February 16, 1911.

Patented May 9, 1911.

Serial No. 608,948.

pair of diverging extensions 4,, 4 the outer surfaces of which form continuations of the forward and-rear surfaces of the tooth point itself, and the inner surfaces of which form the sides of a transverse notch 6, which extends across the base of the tooth point 4. The notch 6 in the base of the tooth point 1 is not continuous, except for a short space adjacent the end of the extension 4. It is interrupted about midway between the side surfaces 18 by a tenon 7, which is referably cast or otherwise formed integral with'the tooth point 4, and serves to divide the transverse notch 6 into a pair of notches at each side of the base of the tooth point. This tenon may be formed with straight sides, but we prefer to make it of the dovetail type. To this end the sides of the tenon adjacent the top or outer edge 7 are made flared, as shown at 8. Below the flaring side surfaces 8 is a pair of parallel side surfaces 9, and immediately beneath the latter is a pair of longitudinal triangular projections 10. These projections 10 are connected by inclined surfaces 11 with the bottom of the recess 6. This bottom of the recess 6 is indicated by the numeral 6, and in order to make the tenon of the same width throughout, the top or outer edge 7 of the tenon and the bottom 6 of therecess 6 are parallel with each other. The end of the extension 4, is cut away as shown at 12, forming a surface which is approximately normal to the forward side of the recess 6. Similarly the end of the extension 1, is cut away as shown at 13, the cutaway surface 13 forming a continuation of the end surface of the tenon 7. It will be noted by referring to Fig. 1 that the bottom 6' of the recess 6, as well as the to 7 of the mortise 7, is approximately paral el to the line L, which indicates the direction of thrust when the shovel teeth are in action. The point or edge 5 will wear away in a direction a proximately parallel to this line L and t e only stress to which the point 4 will be subjected will be that due to the end thrust against the tenon and the surfaces 12 and 13, as well as the forward side of the notch 6.

l The forward or upper part of the body 1 of the tooth has incut surfaces 12 and 13, corresponding to the cutaway ends 12 and 13 of the extensions 4, and 4,. Between these incut surfaces is a triangular projection 19, which is shaped to fit the recess 6 in the tooth point 4, and is centrally mortised to receive the tenon 7. The mortise is shaped to correspond with the shape of the tenon, so that the lateral projections on the tenon will snugly fit the mortise.

The base of the projection 19 of the body of the tooth 1 is provided with a perforatic 1 14, which registers with a similar perforation 15 in the tenon 7 when the point 4: is in place.

16 is a pin passing through the holes 14 and 15 to hold the tooth point 4 and the body of the tooth 1 together.

When in action. the tooth will wear away along the line L, and the mortise and tenon or dove-tailed point will be efficiently protected by means of the extensions 4, and 4 the ends ofwhich fit snugly against the incut surfaces 12 and 13 of the body of the tooth 1. The end thrust is easily borne by the end of the tenon 7 and the forward side of the notch 6 and triangular projection 19,

and stresses due to tension and shearing are eliminated. The tooth point fits upon the body 1 as snugly and tightly as if it were made in one piece therewith, and the pin 16 merely serves to hold the parts together,

. without having to withstand any of the stress which the point itself encounters when the shovel makes its working stroke. For this reason the pin may be of almost any material, and under certain conditions the attendant could fashion a rough wooden peg to fit the openings 14 and 15, and make it do service instead of a bolt, until a bolt could be obtained. By means of a tooth so designed, that is, by eliminating all stresses except those due to end thrust, we are enabled to use a much shorter tooth point than has heretofore been employed, and keep using the same until it is worn away to a much greater extent, before it is necessary to replace the point by a new one.

While we have shown and described our improved tooth point as provided with a tenon toengage a mortise in the end of the body of the tooth, we may obviously reverse the relation of parts and form the mortise in the point if desired;

Having thus described our invention, we claim as new and desire to secure by Letters Patent: 1. A removable tooth point for steam v' shovels and other excavating apparatus, provided with a'forward or working end, and having means at the base of the point for makm a tenon and mortise engagement wlth t e tooth body, the longitudinal axis of said means being a proximately parallel to the wearing line'ofp the said tooth point.

2.! A. removable tooth point for-steam shovels and other excavating apparatus, hav mg a forward or Working end, and provided 'with means at the other end or base of the said point for making a dove-tailed joint to attach the point to -y jthe body ofi the tooth, the longitudinal ax'ilgof the said dove-tailed joint being apprpxjinately parallel to the across the same, the tenon being approximately parallel to the wearing line of said point, and being adapted to fit into a correspondingly-shaped mortise in the end of the body of the tooth.

5. A removable tooth point for steam shovels and other excavating apparatus, having a forward or working end and a transverse notch in the base of said point, a central tenon located in said notch and having its longitudinal axis approximately parallel to the wearing line of the tooth point, the said tenon being flanked at its forward end and along the bottom of the same by extensions of the tooth point forming the sides of said notch, a triangular projection on the end of the body of the tooth,

said projection being shaped to fit the notch Y in the base of. the tooth point, and-having a mortise to receive the tenon, and a pin passing through corresponding openings in the mortise projection and the tenon to hold the point and body of the tooth together.

6. A removable tooth point for steam shovels and other excavating apparatus, having a forward or working end and diverging extensions at the opposite end, forming the sides of a transverse triangular notch, a dove-tailed tenon formed in said notch and flanked along its front and bottom edges by the said extensions, the-axis of'said tenon,

being approximately parallel to the wearing Y i line of said point, a triangular projection on' the body of the tooth to enter and fit said notch, the said triangulanprojection having a mortise shaped to receive the tenon, the

to inclose and protect the joint between the same and the tooth point, and a removable pin" passing through corresponding holes in the mortise projection and. the-tenon to hold the tooth point and the body together;

'7. A shovel tooth comprising-shady; and v a polnt having a mortiseand tenon engage ment with each other, said mortise and tenon, being approximately parallel to thewearing line of the point, said body and point having means for inclosing and protecting the mortise and tenon connection between the body and the point.

8. A shovel tooth comprising a body and a point having a mortise and tenon engagement with each other, said mortise and tenon being approximately parallel to the wearing line of the point, said body and point having, interfitting projections and recesses flanking the said tenon and mortise connection to inclose and protect the same.

9. A shovel tooth comprising a body and a point having a mortise and tenon engagementwith each other, the longitudinal axis of said mortise and tenon being approximately parallel to the wearing line of the point.

10. A shovel tooth comprising a body and a point having a dovetailed engagement 20 with each other, the longitudinal axis of said dovetailed joint being approximately parallel to the wearing line of the point.

In testimony whereof we have signed our names to this specification in the presence of 25 two subscribing witnesses.

CHARLES H. MULRONEY. ISAAC B. MANNING.

Witnesses:

E. M. GATIIRIGHT, HERBERT HAWK. 

